Mountlake Terrace police detectives in July sought a judge's permission to access the young man's online accounts and look for evidence, according to a search warrant obtained by The Herald.
In late August, the police department forwarded the completed investigation to juvenile prosecutors, Cmdr. Doug Hansen said. The young man reportedly told police that he sent the messages because he was angry with his mother and "lashed out at the nearest female he could," Hansen said.
The boy was 15 at the time.
Once the police finished their investigation, the boy was "emergency expelled before the start of the school year," said DJ Jakala, spokeswoman for the Edmonds School District, which serves Mountlake Terrace.
The messages were sent to the teacher's school-district email address in May and June.
On May 1, the teacher received five messages containing sexually explicit language. The messages came from an email address she didn't recognize. She was "shocked and alarmed by these unsolicited emails" and feared for her safety, detectives wrote in the search warrant.
The student also reportedly used social networking websites to send additional messages to the teacher. He allegedly made a Pinterest profile and posted sexually themed messages about the teacher.
The student then reportedly sent the teacher Google+ invites from his own account and a fake account on the same day. The fake account's profile information included descriptions of sexual acts he wanted to perform with the teacher.
Police confronted the student June 20. He said he had heard of the alias that was being used in the messages. The student reportedly said someone with that alias also had bothered a female friend of his at school.
When detectives talked to the young woman, she said she'd never heard of the alias. She reportedly told police that she was not friends with the young man, and that he'd sent her a creepy text message before.
After June 20, the teacher stopped receiving the messages, court papers show.
The Herald is not naming the suspect because he is a minor and has not been charged with a crime. He has no known criminal history.
Rikki King: 425-339-3449; email@example.com.
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